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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x^4)/(x^2) = 0
8*x^2 = 0 // : 8
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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